Steam-pump.



L. K. STEVENS.

STEAM PUMP.

APPLICATION FILED MAR. 29, 1912.

1,042,497., Patented Oct. 29, 1912.

2 SHEETS-SHEET l.

- COLUMBIA PLANOGRAPH 60-, WASHINGTON. D. c,

L. K. STEVENS.

STEAM PUMP.

APPLICATION FILED MAR. 29, 1912.

1,042,497, Patented 001;. 29, 1912. v

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LEON STEVENS, OF NEW YORK, N. Y., ASSIGNOR To M. 'r. DAVIDSON COMPANY, ACORPORATION OF NEW YORK.

STEAM-PUMP.

Application filed March 29, 1912.

To all whom it may concern Be it known that I, LEON K. STEVENS, acitizen of the United States, and a resident of New York city, boroughof Brooklyn, in the county of Kings and State of New York, have inventedcertain new and useful Improvements in Steam-Pumps, of which thefollowing is a specification.

My invention relates to engines such as steam pumps and particularly tothe valve portions.

The object of my invention is to provide a valve construction of simpleand durable construction which may be operated without the use of anylubricant other than the moisture contained in the working fluid.

A further object is to provide a construction in which all the valveparts may be arranged on the top or side of the steam cylinder of theengine and removed therefrom entirely without removing or changing anyof the parts of the main working cylinder.

A further object is to provide a construction in which the valveelements are practically steam balanced, thereby preventing excessivewear.

Further objects and advantages will be pointed out in the followingspecification.

Referring to the drawings which form a part of this specification Figurel is a longitudinal sectional view through the steam valve and cylinderportions of the stem end of a pump or engine. Fig. 2 is a crosssectional view taken on a line through the center of the inlet andexhaust ports. Fig. 3 is a sectional view on a larger scale, through themechanically operated control valve. Fig. 4 is a cross sectional view ofa portion of the control valve. Fig. 5 is a View of one of the halfportions of the control valve disclosing chambers formed therein and theform of spring employed.

20, indicates the usual steam cylinder casting of a steam pump; 21, thecylinder formed therein; 22, the yoke frame which connects the steamcylinder casting to the water cylinder casting.

23, is a casting containing the main steam valve cylinder 24: in whichare located two pistons 25 and 26 respectively, which are connectedtogether by a rod 27 of smaller diameter than the opening formed in thevalve 27 through which it extends and control a slide valve 27 which islocated between them and is free to move vertically at Specification ofLetters Patent.

Patented Oct. 29, 1912.

Serial No. 687,053.

a right angle to the axis of the rod 27 to permit the valve to movedownward relative to the pistons in case of wear, as will be readilyunderstood.

Each of the pistons 25 and 26 is provided with a perforation or passage28 which establishes communication between the main steam chest or inletpassage 29 which is inclicated in dotted lines in Fig. 1, and may belocated on either side of the cylinder 24, which perforations permitsteam to pass from the chamber 29 through the pistons to the spacesformed at the outer end of same, alternately as the valve 27 isreciprocated, as will be readily understood.

The top of the valve 27 is provided with a longitudinally extending slot27*, and a cover 27 is provided with a depending guide 27 which extendsthrough an opening 24 formed in the cylinder 24:, and into said slot toguide the valve and prevent it from turning on its axis.

A longitudinally extending recess 27 and 27 respectively are formed ineach side of the valve, one of said recesses being located opposite theinlet port 29, said recesses per mitting the steam to flow to each sideof the valve to balance same, thus leaving the exhaust passage under thevalve the only unbalanced area, and this area being relatively small,the valve as a whole is practically steam balanced, and will wear wellon this account.

The casting 23 is provided with steam passages 30 and 31 respectivelywhich extend from the chamber or inlet port 29 when the valve is inposition to admit steam to the opposite ends of the cylinder 21, and arecontrolled by the valve 27. Formed in the ca'sting23 is a cylindricalopening which extends entirely through from side to side, and isprovided at one end with a cap 33 and exhaust pipe 34, through which theexhaust steam flows when liberated from the cylinder 21.

Fastened to the opposite side of the cast ing 23 is a ring 35 which isprovided with a projecting portion 36 which enters the opening 32,hereinafter referred to as the exhaust chamber. Fitted in the ring 35 isa rotary valve 37 which I prefer to make in two parts, but which couldbe made in one piece if desired. The valve 37 comprises twosemi-circular portions which are alike in form and are fitted to closelycontact with the inner periphery of the ring 35. One of said portions isprovided with a port 38 and the other with a port 38 which are adaptedto register alternately with the ports 39 and 40 formed in the ring 35and the outlets of which are preferably located diametrically oppositeto each other to balance the steam pressure on the valve 37, and whichin turn communicates respectively with the passages 41 and 42 formed inthe casting 23 and leading to the respective ends of the cylinder 24.

When the control valve 37 is made in two halves as illustrated, adepression 43 or chamber is formed in each half between the abuttingportions and a spring 44 is placed in each chamber and exert pressureagainst the valve elements to hold their outer surfaces in contact withthe seat to keep the parts in close contact even after the valve hasbecome worn to a considerable degree.

Each of the segments of the valve 37 is provided with a projection 46which for the purpose of easy machining I prefer to form in the arc of acircle as illustrated and which projections serve as abutments. Thevalve 37 is provided with a central opening 47 which serves as an exitfor the steam exhaust from behind the pistons 25 and 26 and also permitsthe exhaust steam to flow to each side of this valve 37 to preserve asteam balance during the exhaust of the steam from the main cylinder.

The ring 35 is provided with an annular flanged portion 48 against whichone face of the valve 37 may abut to prevent said valve from slippinginto the chamber 32. A flanged casting 50 is fitted to the outer surfaceof the ring 35 and is provided with a bore 51 and a bearing 52. Arotatable shaft 53 is fitted in the bearing 52 and carries on its innerend a flange 54 which is fitted in the bore 51 and extending across theface of the flange 54 and formed integral therewith is a rectangularshaped projection 55, the opposite ends of which extend to the ends ofthe abutments 46 formed on the valve 37. The ring 35 is preferablyfitted to the face of the casting 23 by a ground joint at 56 to insurethe ports which lead from the valve cylinder 24 to the exhaust chamberbeing tight at this point.

The flanged casting 50 and ring 35 are held. to the casting 23 by bolts57-57 etc. which extend entirely through the casting 50 and ring 35 andscrew into the casting 23 as illustrated. A piston 58 is fitted in themain cylinder 21 and is provided with the usual piston rod 59 whichextends through the stuffing box 60 and carries a cross head 61.Connected with and reciprocated by the cross head 61 and piston 59 is aside rod 62 which connects with a lever 63, which in turn is connectedto the shaft 53. The lever 63 which is indicated in dotted lines in Fig.1 is provided at one end with a slot 64 also indicated in dotted linesto permit the movement of the lever 63 to be varied depending on thepoint at which the side rod 62 is connected with the lever, as will bereadily understood.

Assuming that steam is admitted through the inlet pipe 65, through theinlet port 29, steam will flow through the passage 27 to the inner facesof the pistons 25 and 26 and through the passages 28 in the pistons 25and 26 respectively, thus balancing the same and also around into therecess 27 thereby balancing the valve pressure on the sides of the valve27. In the position of the valve as shown in Fig. 1, the steam hasexhausted through the passage 41 and is in open communication with theexhaust port and the piston 58 is beginning its stroke with steamsupplied through passage 31. It will be understood that the passages 41and 42 are of considerably greater area than the passages 28 in thepistons 25 and 26, so that the steam from behind the pistons willexhaust very rapidly compared to the amount of steam which is passingthrough the port-s 28.

lVhen the valve pistons have reached the respective end of their stroke,the piston located adjacent the head of the cylinder will overrun andcover the valve port to passage 41 as illustrated in Fig. 1, thushelping to prevent leakage of steam even though the control valve shouldbecome worn and leaky. The piston 58 now begins to make its stroke, andthe piston rod transmitting motion through the side rod 62 and lever 63to the shaft 53 and turning said shaft until the projecting abutment 55contacts with the end of the abutments 46 when the valve will begin torotate and the ports 38 will be carried around into communication withthe ports 40, thus opening a passage for the high pressure steam in thechamber 66 to exhaust from said chamber through said ports and valve tothe exhaust chamber 32 and thence to the atmosphere. It will be obvious,however, that the passages 28 may be formed in the walls of the cylinder24 and lead to the opposite ends thereof, the function being simply tocarry the steam behind the ends of the pistons.

The high pressure steam at the opposite end of the piston 25 will thenexert its force and force the valve 27 to the opposite end of thecylinder 24, thus permitting the steam to exhaust through the passage 31from the cylinder 21, under the valve 27 to the exhaust chamber 32 andadmitting steam through the passage 30 and the opposite end of thepiston 58 to reverse the stroke of said last named piston. The piston 58on again the steam from behind the piston and permitting the steambehind the piston 26 to exert its pressure and move the valve 27 to theposition shown in the drawing, thus admitting steam through the port 31to the piston. 58 and cause it to make its next stroke as will beclearly understood.

By reason of having all of the valve elements located in a singlecasting which is bodily removable from the main cylinder casting 20, thevalve parts may be repaired or renewed in less time and with much morefacility than were any of said valves located in the cylinder heads orconnected with the casting 20.

Having thus described my invention, I claim as new 1. A steam pumpcomprising an exhaust passage, a removable ring abutting said passageand fitting therewith, said ring having ports therein, a rotary valvehaving ports adapted to register alternately with said ports in saidring, and means for rotating said valve to alternately open and closecommunication between said ports, substantially as set forth.

2. A steam pump comprising a removable ring having ports therein, arotary valve comprising two segments placed together to form a circularperiphery and fitted to rotate in said ring, said segments beingprovided with exhaust ports which are adapted to register alternatelywith said ports in said ring, and means for rotating said valve toalternately open and close said ports.

3. A steam pump comprising a removable ring having ports therein, arotary valve consisting of two segments placed together to form acircular periphery and fitted to rotate in said ring, said segmentsbeing provided with exhaust ports which are adapted to registeralternately with said ports in said ring, and means for rotating saidvalve intermittently to alternately open and close said ports.

at. A steam pump comprising a removable ring having ports therein, arotary valve consisting of two segments placed together to form acircular periphery and fitted to rotate in said ring, both of which areprovided with exhaust ports which are adapted to register alternatelywith said ports in said ring, means for balancing the steam pressure oneach side of said valve, and means for rotating said valve toalternately open and close said ports.

5. A steam pump comprising a removable ring and having ports therein, arotary valve consisting of two segments placed together to form acircular periphery and fitted to rotate in said ring, said segmentsbeing provided with ports adapted to register alternately with saidports in said ring, means for forcing said segments in contact with theinner surface of said ring, and

means for rotating said valve to alternately open and close said ports.

6. A steam pump comprising a circular seat having ports therein, arotary valve consisting of two segments placed together to form acircular periphery and fitted to rotate in said seat, one segment ofwhich is provided with an exhaust port which is adapted to register withan exhaust port in said seat, and means for rotating said valve toalternately open and close said port.

7. A steam pump comprising a circular valve seat having steam exhaustports formed therein, a rotary valve comprising two segments placedtogether to form a circular periphery and fitted to rotate in said seat,said segments having a central bore and each provided with an exhaustport, and means for rotating said valve to alternately open and closethe exhaust ports in said valve seat 8. A steam pump comprising acircular valve seat having steam exhaust ports formed therein a rotaryvalve comprising two segments placed together to form a circularperiphery and fitted to rotate in said seat, said segments being eachprovided with an exhaust port, and means for rotating said valve toalternately open and close the exhaust ports in said valve seat.

9. A steam pump comprising a removable ring having a circular valve seatand having steam exhaust ports formed therein, a rotary valve comprisingtwo segments placed together to form a circular periphery and fitted torotate in said seat, said segments being each provided with an exhaustport, and means for rotating said valve to alternately open and closethe exhaust ports in said valve seat.

10. A steam pump comprising a removable ring having a circular valveseat and having steam exhaust ports formed therein, a rotary valvecomprising two segments placed together to form a circular periphery andfitted to rotate in said seat, said segments being each provided with anexhaust port, and means for intermittently rotating said valve toalternately open and close the exhaust ports in said valve seat.

11. A steam pump comprising a removable ring having a circular valveseat and having steam exhaust ports formed therein, a rotary valvecomprising two segments placed together to form a circular periphery andfitted to rotate in said seat, said segments having a central bore, andeach provided with an exhaust port, and means for intermittentlyrotating said valve to alternately open and close the exhaust ports insaid valve seat.

12. A steam pump comprising a removable ring having a circular valveseat and having steam exhaust ports formed therein, a rotary valvecomprising two segments placed together to form a circular periphery andfitted to rotate in said ring, said segments being provided with exhaustports which are adapted to register alternately with said ports in saidring, said segments being each provided with a projection on each sidethereof forming abutments, a shaft provided with a projecting flangeadapted to engage said abutments, and means for rotating said shaft tooperate said valve.

13. A steam pump comprising an exhaust passage, a removable ring havingan annular projection fitting within the passage, said ring also havingports therein, a rotary valve having a port adapted to registeralternately with said ports in said ring, and means for rotating saidvalve to alternately open and close communication between said ports,substantially as set forth.

14:. A steam pump comprising a removable ring having ports therein, arotary valve consisting of two segments placed together to form acircular periphery and fitted to rotate in said ring, one segment ofwhich is provided with an exhaust port which is adapted to registeralternately with said ports in said ring, and means for rotating saidvalve to alternately open and close said ports.

15. A steam pump comprising a removable ring having ports therein, arotary valve consisting of two segments placed together to form acircular periphery and fitted to rotate in said ring, one segment ofwhich is provided with an exhaust port which is adapted to registeralternately with said ports in said ring, and means for rotating saidvalve intermittently to alternately open and close said ports.

16. A steam pump comprising a removable ring having ports therein, arotary valve consisting of two segments placed to gether to form acircular periphery and fitted to rotate in said ring, one segment ofwhich is provided with an exhaustport which is adapted to registeralternately with said ports in said ring, means for balancing the steampressure on each side of said valve, and means for rotating said valveto alternately open and close said ports.

17. A steam pump comprising a removable ring having ports therein, arotary valve consisting of two segments placed together to form acircular periphery and fitted to rotate in said ring, one segment ofwhich is provided with an exhaust port which is adapted to registeralternately with said ports in said ring, means for forcing saidsegments in contact with the inner surface of said ring, and means forrotating said valve to alternately open and close said ports.

Signed at New York city, in the county of Kings and State of New Yorkthis 19th day of March A. D. 1912.

LEON K. STEVENS.

Witnesses:

FRANK M. ASHLEY, W. C. NEWELL.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

